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There’s probably some effects stock footage out there… you can try detonationfilms.com, but i’m not sure if they’ll have what you’re looking for.
To tape for compositing, having a black background and using the "screen" composite mode in your NLE might be the easiest technique for its fairly good results.
Detonation films has effects stock footage of explosions and other firey effects, you may want to borrow some of their approaches when you record your fire. They also have a tutorial to composite their footage.
I would suggest playing with their footage, so you’ll know what/how you will want to film your footage, and also because its fun.